<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>克隆优化节点操作</title>
  </head>
  <body>
    <p id="box1">old</p>
    <script>
      for (let index = 0; index < 3; index++) {
        var oP = document.createElement("p");
        oP.innerHTML = i;
        document.body.appendChild(oP);
      }

      var oldP = document.getElementById("box1");
      for (let index = 0; index < 3; index++) {
        var newP = oldP.cloneNode(false);
        newP.innerHTML = i;
        document.body.appendChild(newP);
      }
    </script>
  </body>
</html>
